Investigation Committee on the Accident at the Fukushima Nuclear Power Stations of Tokyo Electric Power Company: timeline of activities (2011)

Month Day Main Activities

May 24 The government decides to establish the Investigation Committee at a Cabinet meeting.

The Prime Minister appoints Dr. Yotaro Hatamura as chairperson.

May 27 The Prime Minister appoints Dr. Kazuo Oike, Dr. Shizuko Kakinuma, Mr. Yukio Takasu, Mr. Toshio Takano, Mr. Yasuro Tanaka, Ms.

Yoko Hayashi, Mr. Michio Furukawa, Mr. Kunio Yanagida and Mr. Hitoshi Yoshioka as committee members.

Jun. 7 First Session

Address by the Prime Minister.

Address by the Chairperson.

The Committee determines management procedures and investigation items.

The Chairperson appoints Mr. Seiji Abe and Dr. Masao Fuchigami as technical advisors.

Hearing of explanations from the Nuclear and Industrial Safety Agency of the Ministry of Economy, Trade and Industry.

Jun. 17 Inspection of Tokyo Electric Power Company’s Fukushima Daiichi and Daini Nuclear Power Stations.

Jun. 30 As above.

Jul. 8 Second Session

The Committee arranges the handling of materials and information, relevant interview methods and other procedures.

The Committee determines investigation and verification items (details).

Hearing of explanations from Tokyo Electric Power Company.

Jul. 15 Inspection of the Tokai Daini Nuclear Power Station of the Japan Atomic Power Company, Ltd.

Jul. 24 The Chairperson has a meeting with Mr. John P. Holdren, Assistant to the US President for Science and Technology.

Jul. 27 The Chairperson has a meeting with Mr. Yukiya Amano, Director General of the International Atomic Energy Agency (IAEA).

Aug. 5 Inspection of the Onagawa Nuclear Power Station of the Tohoku Electric Power Company, Inc.

Aug. 19 Inspection of the Haramachi Thermal Power Plant of the Tohoku Electric Power Company, Inc.

Sep. 9 Inspection of the Hamaoka Nuclear Power Station of the Chubu Electric Power Company, Inc.

Sep. 27 Third Session

Reports on the investigation status.

Oct. 14 Inspection of the Kashiwazaki Kariwa Nuclear Power Station of Tokyo Electric Power Company.

Oct. 28 Fourth Session

Reports on the investigation status.

Discussion for the Interim Report.

Nov. 9 Hearing of opinions of Toshitsuna Watanabe, Mayor of Okuma, and Katsutaka Idogawa, Mayor of Futaba.

Nov. 29 Fifth Session

Discussion of the Interim Report plan.

Dec. 26 Sixth Session

Summary and announcement of the Interim Report.

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Establishment of the Investigation Committee on the Accident at the Fukushima

Nuclear Power Stations of Tokyo Electric Power Company

May 24, 2011

Cabinet Decision

1. Purpose

The government establishes the Investigation Committee on the Accident at the Fukushima

Nuclear Power Stations of Tokyo Electric Power Company (hereinafter referred to as the

“Investigation Committee”) with the aim of making policy proposals on measures to prevent further

spread of the damage caused by the accident and a recurrence of similar accidents in the future. This

will be done by conducting a multifaceted investigation in an open and neutral manner that is

accountable to the Japanese public to determine the causes of the accident at the Fukushima Daiichi

and Daini Nuclear Power Stations and the causes of the damage due to the accident.

2. Composition of the Investigation Committee

(1) The members of the Investigation Committee shall be appointed by the Prime Minister from

persons with academic and other various backgrounds.

(2) The Prime Minister shall appoint the chairperson of the Investigation Committee from among its

members.

(3) The chairperson may appoint technical advisors to give the Investigative Committee advice on

technical matters.

(4) The Investigation Committee may, when necessary, ask any relevant minister including the Prime

Minister, official of any relevant administrative organizations, officer or employee of relevant

businesses, official of any international organization on nuclear energy, or any other relevant person,

to attend a meeting with the Investigation Committee.

3. Responsibilities of the relevant ministers

(1) All relevant ministers and officials of related administrative organizations shall fully cooperate

with the operations of the Investigation Committee and shall not refuse requests from the Investigation

Committee for materials and explanations without reasonable grounds.

(2) The ministers concerned shall exercise their authority based on applicable laws to instruct the

relevant businesses to fulfill any requests by the Investigation Committee’s for on-site investigations,

materials and explanations.

4. Other matters

Administrative affairs pertaining to the Investigation Committee shall be conducted by the Cabinet

Secretariat in cooperation with the relevant administrative organizations.

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Rules on the establishment of the Secretariat of the Investigation Committee on the

Accident at the Fukushima Nuclear Power Stations of Tokyo Electric Power Company

May 31, 2011

Decision of the Prime Minister

ESTABLISHMENT AND DUTIES

Article 1. The Secretariat of the Investigation Committee on the Accident at the Fukushima Nuclear

Power Stations of Tokyo Electric Power Company (hereinafter referred to as the “Secretariat”) shall be

established in the Cabinet Secretariat with the aim of assisting the investigation by the “Investigation

Committee on the Accident at the Fukushima Nuclear Power Stations of Tokyo Electric Power

Company” and dealing with the administrative work of the Committee.

STRUCTURE

Article 2. The Secretariat shall have a secretary-general, counselor, senior planning officer and other

necessary officials.

(2) The secretary-general shall manage the administrative work of the Secretariat.

(3) The counselor shall participate in the investigation, planning and development of important matters

by following the instructions of the secretary-general.

(4) The senior planning officer shall be engaged in the administrative work related to the investigation,

planning and development of technicalities by following the instructions of the secretary-general.

(5) The secretary-general, counselor, senior planning officer and other officials may be employed

part-time.

POLICY AND TECHNICAL INVESTIGATION ADVISORS

Article 3. The Secretariat may have policy and technical investigation advisors.

(2) The policy and technical investigation advisors shall investigate and state their opinions on

technical matters related to the jurisdiction of the Secretariat and handle the administrative work

otherwise ordered by following the instructions of the secretary-general.

(3) The policy and technical investigation advisors may be employed part-time.

SUPPLEMENTARY RULE

Article 4. In addition to what is provided for in the preceding Articles, necessary matters in relation to the internal organization of the Secretariat shall be specified by the secretary-general.

SUPPLEMENTARY PROVISION

The rules herein shall be effective from June 1, 2011.

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*The team will be formed as required depending on the progress made by the other three teams.

Structure of the Investigation Committee on the Accident at the Fukushima Nuclear Power Stations of Tokyo Electric Power Company

Investigation Committee on the Accident at the FukushimaNuclear Power Stations of Tokyo Electric Power Company

Accident Causes Investigation Team,

responsible for:- Technical problems that led to the accident- Appropriateness of the initial response to the accident- Measures taken to prevent further damage to the plants- International cooperation

Damage SpreadPrevention Measures

Investigation Team, responsible for:

- Appropriateness of measures taken prior to the accident- Appropriateness of evacuation and other measures- Appropriateness of communication to local residents and other people- International cooperation

Dir

ecto

r-G

ener

al

- Responsible for general management, dealing with the Diet sessions and general affairs relating to the committee

Technical Advisors

Legal RegulationExamination Team,

responsible for:- Emergency preparedness- Safety regulation and nuclear disaster prevention measures at ordinary times- How related administrativeorganizations should be built

Social System Investigation Team,

responsible for:- System and concept of safety regulations- History of related technologies- Pre-accident backgroundrelating to the Fukushima nuclear power plants

Secretariat

General Affairs Group (responsible for matters thatinclude general affairs and accounting)

Subgroup in charge of externalcommunication and coordination

- Responsible for communication with and coordination of related government ministries and agencies, related overseas agencies, etc., and for collecting basic data and information

Opinions

Information

- Team Director: anexpert in the area or related matters- Deputy director- Team members

- Team Director: anexpert in the area or related matters- Deputy director- Team members

- Team Director: anexpert in the area or related matters- Deputy director- Team members

Foreigncountries

U.S.,U.K.,France,Russia,China,S. Korea,etc.

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List of experts (policy and technical investigation advisors) at the Secretariat of the Investigation Committee on the Accident at the Fukushima Nuclear Power

Stations of Tokyo Electric Power Company

Social System Investigation Team 【Team Director】

Dr. Hideyuki Horii Professor, Department of Civil Engineering, Graduate School of Engineering, The University

of Tokyo

(Area of specialization: sociotechnology, safety and security) 【Team Member】

Mr. Hideaki Shiroyama Professor, Graduate School for Law and Politics, The University of Tokyo

(Area of specialization: public administration)

Accident Causes Investigation Team 【Team Director】

Dr. Seiichi Koshizuka Professor, Department of Systems Innovation, Graduate School of Engineering, The University

of Tokyo

(Area of specialization: computer simulation, severe accident analysis for nuclear reactors) 【Team Member】

Dr. Hiroyuki Oigawa Director, Research Coordination and Promotion Office, Nuclear Science and Engineering

Directorate, Japan Atomic Energy Agency

(Area of specialization: reactor physics) 【Team Member】

Dr. Yuji Nakasone Professor, Department of Mechanical Engineering, Faculty of Engineering, Tokyo University

of Science

(Area of specialization: strength of materials, computational solid mechanics)

Damage Expansion Prevention Measures Investigation Team 【Team Director】

Dr. Toshitaka Katada Professor, Director, Research Center for Disaster Prevention in the Extended Tokyo

Metropolitan Area, Gunma University

(Area of specialization: disaster information, evacuation behavior, disaster education)

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【Team Member】

Dr. Katsuya Yamori Professor, Disaster Prevention Research Institute, Kyoto University

(Area of specialization: disaster psychology, social psychology) 【Team Member】

Mr. Naoya Sekiya Associate Professor, Department of Media and Communications, Faculty of Sociology, Toyo

University

(Area of specialization: social psychology, disaster information theory)

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Management procedures of the Investigation Committee on the Accident

at the Fukushima Nuclear Power Stations of Tokyo Electric

Power Company

June 27, 2011

Decision of the Investigation Committee on the Accident at the Fukushima Nuclear Power

Stations of Tokyo Electric Power Company

In addition to what is provided for in “Establishment of the Investigation Committee

on the Accident at the Fukushima Nuclear Power Stations of Tokyo Electric

Power Company (Cabinet Decision on May 24, 2011),” the procedures of meetings and other

matters concerning the administration of the Investigation Committee on the Accident at the

Fukushima Nuclear Power Stations of Tokyo Electric Power (hereinafter referred to as the

“Investigation Committee”) shall be determined as follows:

DEPUTY CHAIRPERSON

Article 1. In the absence of the Chairperson, a Committee member nominated in advance

by the Chairperson shall act on their behalf.

PROCEEDINGS OF THE INVESTIGATION COMMITTEE

Article 2. The Investigation Committee shall convene when summoned by the Chairperson.

(2) The Investigation Committee may not hold a meeting unless the majority of

its members are present.

(3) In principle, decisions by the Investigation Committee shall be made with the

unanimous agreement of all attendees. However, in the event that unanimous agreement

is not reached, decisions shall be made by the majority of the members present at the

discretion of the Chairperson.

DISCLOSURE OF PROCEEDINGS OF THE INVESTIGATION COMMITTEE

Article 3. In principle, proceedings of the Investigation Committee shall be

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disclosed. However, they may not be disclosed in the event their disclosure is likely to be

detrimental to the rights or interests of any third party or the public’s interest, or otherwise

approved by the Chairperson.

(2) In principle, documents distributed at and proceedings of a meeting

of the Investigation Committee shall be disclosed. However, they may not be disclosed

in the event their disclosure is likely to be detrimental to the rights or interests of

any third party or the public’s interest, or otherwise approved by the Chairperson.

SUBCOMMITTEE

Article 4. The Investigation Committee may resolve to have

subcommittees if they are necessary for studying and deliberating specialized matters.

(2) In addition to what is specified by the resolution described

in the preceding paragraph, necessary matters for the administration of subcommittees shall

be specified by the Chairperson.

PARTICIPATION OF TECHNICAL ADVISORS IN THE INVESTIGATION COMMITTEE

Article 5. Technical Advisors may attend the Investigation Committee meetings with the

approval of the Chairperson to state their opinions on matters requested

by the Chairperson.

INSTRUCTION FOR THE SECRETARIAT TO INVESTIGATE

Article 6. The Investigation Committee and the Chairperson may have the Secretariat

conduct necessary investigations.

MISCELLANEOUS PROVISION

Article7. In addition to what is provided for

in the preceding Articles, necessary matters for the administration

of the Investigation Committee shall be specified by the Chairperson.

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Information and informative materials to be handled without disclosure

July 8, 2011

Terms of the Investigation Committee on the Accident at the Fukushima Nuclear Power

Stations of Tokyo Electric Power Company

1. (1) The members and technical advisors (hereinafter referred to as “Members and

Advisors”) of the Investigation Committee on the Accident at the Fukushima Nuclear

Power Stations of Tokyo Electric Power Company (hereinafter referred to as the

“Committee”) shall not disclose confidential information that becomes known to them

during the investigation process of the Committee even after the completion of their

roles as Members and Advisors.

(2) Information and informative materials obtained during the investigation process

shall be kept securely in an appropriate place, such as the Secretariat of the Committee.

2. (1) In the event that the Committee is provided with information or informative

materials from other parties on the condition that the information or informative

materials are handled confidentially, it shall state specific reasons for their

nondisclosure, including the possibility that the disclosure of such information or

informative materials is not likely to be in the public’s interest or may be detrimental to

the rights and interests of any party concerned (including parties other than the

information provider. This applies hereinafter). The Committee shall handle such

information and informative materials confidentially if the Committee finds reasonable

grounds for nondisclosure.

(2) If the Committee finds reasonable grounds (e.g., the potential for the interest of the

public or the rights and interests of the parties concerned to be compromised) for the

nondisclosure of information or informative materials not falling under (1), the

Committee shall handle the information or informative materials confidentially.

(3) With regard to (1) and (2), in times of urgency, the Chairperson of the Committee

may use his discretion to determine whether the Committee should handle the

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information or informative materials confidentially.

(4) When preparing the interim and final reports, the Committee shall treat such

information and informative materials confidentially.

3. If other parties handle information or informative materials confidentially and do not

comply with the Committee’s request for their provision despite the Committee not

finding any reasonable grounds for nondisclosure, the Committee shall take appropriate

measures, such as disclosing to the public the response of the parties.

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Methods of Interview July 8, 2011

Terms of the Investigation Committee on the Accident at the Fukushima Nuclear Power

Stations of Tokyo Electric Power Company

1. Interviewer

In many cases, Secretariat members take the initiative in holding interviews as

part of their fact-finding missions. Secretariat members, however, shall hold them

together with the Committee members or technical advisors (hereinafter referred to as

“Members and Advisors”) should they wish to participate.

NOTE: The Secretariat shall inform Members and Advisors of the details of an

interview in advance, and those wishing to participate shall do so. However, some

changes may be required depending on the number of Members and Advisors

wishing to participate.

2. Method of Interviewing

(1) Interviews, in principle, shall be conducted in confidence and in small groups.

NOTE 1: Depending on respective interviewees, there are various reasons for the

above,including the following, which are considered major reasons: 1.) To obtain a

testimony of truth; 2.) In many cases, interviews deal with information which is

inappropriate to publicly disclose (e.g. for reasons pertaining to public security);

3.) Interviews often deal with testimonies relating to personal privacy.

(2) With the exception of interviews concerning information specified in 2.) of NOTE

1, an interview shall be disclosed in an appropriate manner (e.g., disclosure to the

media or by recording) with the consent of the interviewee.

NOTE 2: The reasons specified in NOTE 1 are to keep interviews confidential.

However, if the interviewee agrees to the interview being made available to the

public, it shall be conducted in an open manner or on the premise that it will be

disclosed. This is because in such cases, the reasons specified in 1.) and 3.) of

NOTE 1 will not pose a problem while the issue stated in 2.) will be resolved by

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the exception stated in (2) of 2. (“with the exception of interviews concerning

information specified in 2.) of NOTE 1”).

3. Recording of Interviews

When an interview that is not to be disclosed is held, the Secretariat member

in charge shall compile the information delivered in the interview and create a

transcript.

In addition, the interview shall be recorded with the consent of the

interviewee on a digital voice recorder to ensure accuracy. If the interviewee does not

agree or there is no time to arrange a digital voice recorder, the interview shall be held

without being recorded, in which case, however, the Secretariat member in charge shall

take notes as accurately as possible.

4. Handling of Interview Results

(1) The Secretariat shall inform the Members and Advisors of the completion of each

interview without delay.

(2) The Secretariat shall inform the Members and Advisors of the content of interviews

as necessary when it compiles and reports the investigation results to the

Committee.

(3) If the Members and Advisors ask to read the testimonies, in principle, the

Secretary shall directly deliver copies of the testimonies to them by hand (or by an

appropriate alternative method in order to prevent the information being leaked). If

the Members and Advisors request the recordings of the testimonies, they shall

listen to them at the Secretariat office.

5. Use of Interview Results

(1) Interview results shall not be used to pursue liability.

The Committee is not established for the purpose of pursuing the liability of

any party. Therefore, the Committee shall not use material (i.e., the content

of testimonies) obtained from interviews for the purpose of pursuing the liability of

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any party.

(2) When the Secretariat compiles the investigation results of interviews that are not to

be disclosed about each individual’s involvement in contributing to the causes of the

accident and spread of damage, the Secretariat shall give due consideration so that no

individual cooperating with the investigation shall be identified.

Although the Secretariat shall disclose as necessary transcripts obtained from

interviews not to be disclosed, it shall not divulge any information that may identify the

interviewee or which the interviewee requests not to be disclosed. As a recording is

likely to identify the interviewee, no recording shall be disclosed as long as the

interviewee requests its nondisclosure.

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List of English Abbreviations

Abbreviation English Term

ADS Automatic Depressurization System

AEC Atomic Energy Commission

AM Accident Management

AMG Accident Management Guideline

AOP Abnormal Operating Procedures

AO弁 Air Operated valve

APD Alarm Pocket Dosimeter

ARI Alternative Rods Injection

BMU Bundesministerium für Umwelt, Naturschutz und Reaktorsicherheit

BWR Boiling Water Reactor

C/B Control Building

CAMS Containment Atmospheric Monitoring System

CCS Containment Cooling System

CCSW Containment Cooling Sea Water System

CDF Core Damage Frequency

CFF Containment Failure Frequency

CRD系 Control Rod Drive mechanism

CS Core Spray System

D/DFP Diesel-driven Fire Pump

DG Ｄｉｅseｌ Generator

DGSW Ｄｉｅseｌ Generator Sea Water System

DOE United States Department of Energy

DSピット Dryer Separator pit

D/W Drywell

ECCS Emergency Core Cooling System

EOC Emergency Operation Center

EOP Emergency Operating Procedures

EPZ Emergency Planning Zone

ERC Emergency Response Center

ERSS Emergency Response Support System

FAO Food and Agriculture Organization of the United Nations

FP Fission Product

FP系 Fire Protection system

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Abbreviation English Term

FPC系 Fuel Pool Cooling system

HPCI High Pressure Coolant Injection System

HPCS High Pressure Core Spray System

HPCSDG High Pressure Core Spray System Ｄｉｅseｌ Generator

IA系 Instrument Air system

IAEA International Atomic Energy Agency

IC Isolation Condenser

ICRP International Commission on Radiological Protection

INES The International Nuclear and Radiologial Event Scale

IPE Individual Plant Examination

IPEEE Individual Plant Examination for External Events

ＪＡＥＡ Japan Atomic Energy Agency

JAEA/NEAT JAEA/Nuclear Emergency Assistance & Training Center

JAMSTEC Japan Agency for Marine-Earth Science and Technology

JAXA Japan Aerospace Exploration Agency

JNES Japan Nuclear Energy Safety Organization

LPCI Low Pressure Coolant Injection System

LPCS Low Pressure Core Spray System

M Magnitude

M/C Metal-Clad Switch Gear

M/DFP Motor-driven Fire Pump

MCC Motor Control Center

MO弁 Motor Operated valve

MSIV Main Steam Isolation Valve

MUWC系 Make-Up Water Condensate system

NEA Nuclear Energy Agency

NRC Nuclear Regulatory Commission

NUPEC Nuclear Power Engineering Corporation

O.P. Onahama Peil

O.P. Onagawa Peil

OECD NEA OECD Nuclear Energy Agency

P/C Power Center

P/P Physical Protection

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Abbreviation English Term

PAZ Precautionary Action Zone

PRA Probabilistic Risk Assessment

PSA Probabilistic Safety Assessment

PSR Periodic Safety Review

PWR Pressurized Water Reactor

R/B Reactor Building

RCIC Reactor Core Isolation Cooling System

RHR Residual Heat Removal System

RHRS Residual Heat Removal Ｓｅａ Water System

RPS Reactor Protection System

RPT Recirculation Pump Trip

RSK Reaktor-Sicherheitskommission

RW/B Radioactive Weste Disposal Building

S/C Suppression Chamber

SA Severe Accident

SARRY Simplified Active Water Retrieve and Recovery System

SBO Station Black Out

SCSIN Service Central de Sûreté des Installations Nucléaires

SFP Spent Fuel Pool

SGTS Standby Gas Treatment System

SHC Shutdown Cooling System

SLC Standby Liquid Control System

SOP Severe Accident Operating Procedures

SPDS Safety Parameter Display System

SPEEDI System for Prediction of Environmental Emergency Dose Information

ＳＲ弁 main Steam Relief valve

T.P. Tokyo Peil

T/B Turbine Building

TAF Top of Active Fuel

UNSCEAR United Nations Scientific Committee on the Effects of Atomic Radiation

WBC Whole Body Counter

WHO World Health Organization

WSPEEDI Worldwide Version of System for Prediction of Environmental Emergency Dose Information

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